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HTML

<link rel="stylesheet" href="http://code.jquery.com/ui/jquery-ui-git.css">
<script src="http://code.jquery.com/ui/1.10.4/jquery-ui.min.js"></script>
<div class="ui-widget">
    <label for="tags">Tags:</label>
    <input id="tags" />
    <input id="tags2" />
</div>

JavaScript

var availableTags = ["ActionScript", "AppleScript", "Asp", "BASIC", "C", "C++", "Clojure",
    "COBOL", "ColdFusion", "Erlang", "Fortran", "Groovy", "Haskell",
    "Java", "JavaScript", "Lisp", "Perl", "PHP", "Python", "Ruby", "Scala",
    "Scheme"];

$("#tags").autocomplete({
    source: availableTags,
    select: function (event, ui) {
        console.log(ui);
        //$("#tags2").focus();
        //$("#tags").blur();
        //alert('select : ' + ui.item.value);
    },
    change: function (event, ui) {
        console.log(ui);
        if (!ui.item) alert('change : item is null');
        else alert('change : ' + ui.item.value);
    }
});